The PetSafe RFA-67 6 volt Battery 2 pack is designed for use in many of the PetSafe Containment, Bark Control and Remote Trainer collars. They are compatible with the Deluxe Bark Control Collar (PDBC-300-20), UltraLight Ultrasonic Bark Control (PUSB-150-19), Bark Control Collar (PBC19-10765), In-Ground Fence Systems (PRF-3004W-20 & PIG00-13661), Ultralight Add-A-Dog Extra Receiver Collar (PIG19-10761), Deluxe Ultralight Add-A-Dog Extra Receiver Collar (PIG19-10764), Wireless Pet Containment System (PIF-300-21) and Wireless Pet Containment System Add-A-Dog Extra Receiver Collar (PWF19-10762).